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High Speed Mobility Experiments on distributed mimo Beamforming for 5G Radio Access in 28-GHz Band

IEICE TRANSACTIONS ON COMMUNICATIONS 2019年第8期E102B卷 1418-1426页

作者： Kitayama, Daisuke Tateishi, Kiichi Kurita, Daisuke Harada, Atsushi Inomata, Minoru Imai, Tetsuro Kishiyama, Yoshihisa Murai, Hideshi Itoh, Shoji Simonsson, Arne Okvist, Peter NTT DOCOMO Inc Yokosuka Kanagawa 2398536 Japan Ericsson Japan Tokyo 1050021 Japan Ericsson Res S-16480 Stockholm Sweden

This paper describes the results of outdoor mobility measurements and high-speed vehicle tests that clarify the 4-by-8 multiple-input multiple-output (mimo) throughput performance when applying distributed mimo with narrow antenna-beam tracking in a 28-GHz frequency band in the downlink of a 5G cellular radio access system. To clarify suitable transmission point (TP) deployment for mobile stations (MS) moving at high speed, we examine two arrangements for 3 TPs. The first sets all TPs in a line along the same side of the path traversed by the MS, and the other sets one TP on the other side of the path. The experiments in which the MS is installed on a moving wagon reveal that the latter deployment case enables a high peak data rate and high average throughput performance exhibiting the peak throughput of 15 Gbps at the vehicle speed of 3 km/h. Setting the MS in a vehicle travelling at 30 km/h yielded the peak throughput of 13 Gbps. The peak throughput of 11 Gbps is achieved at the vehicle speed of 100 km/h, and beam tracking and intra-baseband unit hand over operation are successfully demonstrated even at this high vehicle speed.

关键词： 5G higher frequency bands distributed mimo massive-mimo beamforming field experiments high-speed mobility

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On the Performance of distributed mimo With Full-Duplex Jamming

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IEEE TRANSACTIONS ON COMMUNICATIONS 2019年第3期67卷 1972-1985页

作者： Jindal, Abhishek Haas, Zygmunt J. Univ Texas Dallas Dept Comp Sci Richardson TX 75080 USA Cornell Univ Sch Elect & Comp Engn Ithaca NY 14853 USA

In this paper, we consider a distributed mimo system with a set of geographically distributed nodes forming a multi-antenna source S, and a set of geographically distributed full duplex (FD) nodes forming a multi-antenna destination D. S and D each forms a transmit and a receive cluster, respectively. D uses FD mode to jam the signal from S at eavesdropper E, incurring some residual self-interference. We assume that neither S nor D has knowledge of their instantaneous channel state information to E. Furthermore, to simplify the system design, especially for the mobile case, we assume as well that S has no knowledge of the ICSI of its channel to D. Hence, adopting ergodic secrecy rate (ESR) as the performance metric, we are interested in evaluating the ESR averaged over the nodes' locations, i.e., cluster averaged ESR. To accomplish this, we obtain a lower bound (LB) and an upper bound of the ESR. As part of our work, we also obtain bounds on the cluster averaged ergodic rate between the two clusters. We demonstrate by simulations that the LB can act as a good approximation of the ESR for practical purposes.

关键词： Cooperative mimo distributed mimo ergodic secrecy rate full-duplex communications intentional jamming physical-layer security reconfigurable distributed mimo

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5G Radio Access Experiments on distributed mimo Deployment for Straightly Traveling Mobile Station with Beamforming in 28-GHz Frequency Band

5G Radio Access Experiments on Distributed MIMO Deployment f...

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IEEE Wireless Communications and Networking Conference (WCNC)

作者： Kitayama, Daisuke Kurita, Daisuke Inomata, Minoru Tateishi, Kiichi Harada, Atsushi Imai, Tetsuro Kishiyama, Yoshihisa Itoh, Shoji Murai, Hideshi Simonsson, Arne Okvist, Peter NTT DOCOMO INC 3-6 Hikarino Oka Yokosuka Kanagawa 2398536 Japan Ericsson Japan Minat Ku 2-3-7Higashi Shinbashi Tokyo Japan Ericsson Res Torshamnsgatan 21 S-16483 Stockholm Sweden

ISBN: (纸本)9781728109220

This paper focuses on a design for a base station (BS) antenna deployment targeting a mobile station (MS) traveling in a straight line assuming application to 5G systems for railways or vehicles. We present experimental results of outdoor measurements under line of sight (LoS) conditions showing 4-by-8 multiple-input multiple-output (mimo) throughput performance when applying distributed mimo with narrow antenna beam tracking in a 28-GHz frequency band in the downlink of a 5G cellular radio access system. To clarify a suitable deployment for a MS traveling along a straight line, two deployment cases are tested in which three BSs are used. One is a case where all transmission points (TPs) are arranged along the moving path of the MS, and the other is a case where two of the three TPs are on each side of the moving path. The experiments, in which the MS is installed on an electric trolley, reveal that the former deployment case has a trade-off relationship between the peak throughput and range. This relationship yields a higher peak throughput for a decrease in the TP separation distance. In contrast, the latter deployment case achieves both a high peak data rate and better throughput performance over the entirety of the traveling path compared to the former case, and exhibits the peak throughput value of 15 Gbps, which is almost the system peak value.

关键词： 5G higher frequency bands distributed mimo massive-mimo beamforming beam tracking field experiments

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A Study on UE Clustering and Antenna Selection for distributed mimo Cooperative Transmission using Multi-user MMSE-SVD 25

A Study on UE Clustering and Antenna Selection for Distribut...

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25th Asia-Pacific Conference on Communications (APCC)

作者： Seki, Yuta Saito, Tomoyuki Adachi, Fumiyuki Tohoku Univ Res Org Elect Commun Aoba Ku 2-1-1 Katahira Sendai Miyagi 9808577 Japan Panasonic Corp Kadoma Osaka Japan NEC Platforms Ltd Tokyo Japan

ISBN: (纸本)9781728136790

distributed multiple-input multiple-output (mimo) is a type of the centralized radio access network (C-RAN) to achieve a high link capacity uniformly over the service area. A large-scale distributed mimo requires prohibitively high computational complexity. Clustering of user equipments (UEs) can reduce the computational complexity, however, this produces the inter-cluster interference (ICI). In this paper, we propose the UE clustering and antenna selection beyond the cluster boundary assuming multi-user minimum mean square error filtering combined with singular value decomposition (MMSE-SVD). We exploit the multiplexing-diversity tradeoff in MMSE-SVD to suppress effectively the ICI while keeping the multi-user multiplexing capability. It is shown that the proposed UE clustering and antenna selection can achieve 6 times higher sum capacity and 1.6 times higher UE capacity, compared to the without clustering.

关键词： distributed mimo UE clustering antenna selection cooperative transmission multi-user mulltiplexing OFDM

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Modified Adaptive 2-Step ICIC for distributed mimo System with User Clustering

Modified Adaptive 2-Step ICIC for Distributed MIMO System wi...

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IEEE VTS Asia Pacific Wireless Communications Symposium

作者： Boonkajay, Amnart Saito, Tomoyuki Adachi, Fumiyuki Tohoku Univ Res Org Elect Commun ROEC Aoba Ku 2-1-1 Katahira Sendai Miyagi 9808577 Japan

ISBN: (纸本)9781728112046

distributed multi-input multi-output (mimo) system with user equipment (UE) clustering can boost up area spectrum efficiency by performing UE scheduling independently in all clusters. However, UEs locating at cell-edge area suffer from strong inter-cell interference (ICI). We have proposed a de-centralized adaptive 2-step ICI coordination (ICIC) which employs UE classification and selection of additional fractional frequency band based on received interference level, but UE clustering has not been considered. In this paper, we modify the adaptive 2-step ICIC so as to fit to distributed mimo system with UE clustering. Multiple cell-edge UEs are scheduled simultaneously and adjust the cell-center UE/cell-edge UE timeslot ratio to keep an average UE connection probability similar to system without ICIC. Simulation results show that the modified adaptive 2-step ICIC improves the cell-edge UE link capacity without significantly degrading entire-cell UE link capacity.

关键词： distributed mimo inter-cell interference coordination user scheduling radio access network

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Location-Domain Channel Representation for Estimating distributed mimo Channels

Location-Domain Channel Representation for Estimating Distri...

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IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS)

作者： Molev-Shteiman, Arkady Qi, Xiao-Feng Mailaender, Laurence Futurewei Technol New Jersey Res Ctr Radio Algorithms Res Bridgewater NJ 08807 USA

ISBN: (纸本)9781538695494

We propose a location-domain channel representation and apply it to channel estimation for distributed mimo (D-mimo) networks. The approach contrasts with various angle-domain formulations that appear well suited for a collocated large array where the far-field assumption allows an angle-domain channel representation but are ill-suited to geographically distributed arrays (large and small), as in densely deployed 5G cellular networks. Our alternative location-domain representation avoids such difficulties by indexing the multipath channel by the locations, instead of angles, of user terminals or access points. Furthermore, it naturally incorporates 3D surrounding information in the form of a 'channel database,' achieving scene-specific SNR gain and ease of machine learning. We demonstrate the efficacy of our proposal through simulation of simple channel estimation algorithms over a narrowband channel. The new channel representation is applied to direct positioning in a companion publication [15].

关键词： distributed mimo Channel Estimation Channel Estimation Location-Assisted Communication

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distributed mimo Network for 5G Enhanced Mobile Broadband 12

Distributed MIMO Network for 5G Enhanced Mobile Broadband

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Conference on Broadband Access Communication Technologies XII

作者： Adachi, Fumiyuki Boonkajay, Amnart Saito, Tomoyuki Seki, Yuta Tohoku Univ Res Org Elect Commun Aoba Ku 2-1-1 Katahira Sendai Miyagi 9808577 Japan

ISBN: (数字)9781510616042

ISBN: (纸本)9781510616042

One of important applications in 5G mobile communications is the enhanced mobile broadband (eMBB). A promising approach for achieving 5G eMBB under the limited radio bandwidth and energy is an introduction of a small-cell structured network. An advanced utilization of multi-input multi-output (mimo) transmission is also another possible approach. First, the conceptual structure of distributed mimo network is introduced. A number of distributed antennas (DAs) are deployed over a macro-cell area and they are connected to a macro-cell base station (MBS) via optical mobile fronthaul. Then, we present the recent advances in distributed mimo cooperative transmission, i.e., space-time block coded transmit diversity (STBC-TD) for improving the link capacity of a macro-cell edge area, minimum mean square error multiuser multiplexing combined with singular value decomposition (MMSE-SVD) for increasing the sum capacity, and blind selective mapping (SLM) for reducing the transmit signal peak-to-average power ratio (PAPR).

关键词： 5G distributed mimo optical mobile fronthaul cooperative transmission space-time block coded transmit diversity MMSE multiplexing singular value decomposition selected mapping

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An Achievable Throughput Scaling Law of Wireless Device-to-Device Caching Networks With distributed mimo and Hierarchical Cooperations

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2018年第1期17卷 492-505页

作者： Guo, Jiajia Yuan, Jinhong Zhang, Jian Univ New South Wales Sch Elect Engn & Telecommun Sydney NSW 2052 Australia CSIRO Data61 Marsfield NSW 2122 Australia Univ Technol Sydney Sch Comp & Commun Ultimo NSW 2007 Australia

In this paper, we propose a new caching scheme for a random wireless device-to-device (D2D) network of n nodes with local caches, where each node intends to download files from a prefixed library via D2D links. Our proposed caching delivery includes two stages, employing distributed mimo and hierarchical cooperations, respectively. The distributed mimo is applied to the first stage between source nodes and neighbors of the destination node. The induced multiplexing gain and diversity gain increase the number of simultaneous transmissions, improving the throughput of the network. The hierarchical cooperations are applied to the second stage to facilitate the transmissions between the destination node and its neighbors. The two stages together exploit spatial degrees of freedom as well as spatial reuse. We develop an uncoded random caching placement strategy to serve this cooperative caching delivery. Analytical results show that the average aggregate throughput of the network scales almost linearly with n, with a vanishing outage probability. Furthermore, we derive an explicit expression of the optimal throughput as a function of system parameters, such as pathloss factor under a target outage probability. Analytical and numerical results demonstrate that our proposed scheme outperforms existing ones when the local cache size is limited.

关键词： Scaling law caching distributed mimo device-to-device communications

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Outdoor Experiment on User Mobility Using distributed mimo Beamforming for 5G Radio Access

Outdoor Experiment on User Mobility Using Distributed MIMO B...

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IEEE Wireless Communications and Networking Conference (WCNC)

作者： Tateishi, Kiichi Kurita, Daisuke Harada, Atsushi Kishiyama, Yoshihisa Itoh, Shoji Murai, Hideshi Simonsson, Arne Okvist, Peter NTT DOCOMO INC Yokosuka Kanagawa Japan Ericsson Japan Minato Ku Tokyo Japan Ericsson Res Stockholm Sweden

ISBN: (纸本)9781538617342

This paper presents outdoor experimental results with a 4 layer single-user (SU)-multiple input multiple-output (mimo) 5G cellular radio access system. Beam tracking with narrow beams are evaluated in the 15-GHz frequency band in order to investigate the effects of user mobility. In addition, distributed mimo beamforming functionality is implemented to extend coverage using multiple transmission points (TPs) supporting 2 layers each. The experimental result in an outdoor open space environment shows that the peak throughput is 12.1 Gbps on a public road at an average speed of approximately 10 km/h. The result also shows that more than 8 Gbps is achieved at an average speed of approximately 40 km/h. Furthermore, it is observed that throughput is remarkably degraded when the difference in the received power between the best and second best transmission point is larger than 15 dB and only 2 layer spatial multiplexing is supported from one of the transmission points.

关键词： 5G massive mimo TDD beamforming beam tracking distributed mimo experiments mobility

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D-mimoO - distributed mimo for Office Wi-Fi Networks

D-MIMOO - Distributed MIMO for Office Wi-Fi Networks

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IEEE International Symposium on Dynamic Spectrum Access Networks (DySPAN)

作者： Krishnan, Neelakantan Nurani Torkildson, Eric Rantala, Enrico Seskar, Ivan Mandayam, Narayan Doppler, Klaus Rutgers State Univ WINLAB North Brunswick NJ 08902 USA Nokia Bell Labs Sunnyvale CA USA

ISBN: (纸本)9781538651919

We present D-mimoO, a distributed mimo Wi-Fi architecture that boosts average network throughput compared to state-of-the-art access points with co-located antennas (baseline configuration). Designing a distributed mimo system invites us to redesign fundamental Wi-Fi concepts, such as carrier sensing multiple access (CSMA) which governs channel access among Wi-Fi access points. We also propose a novel way of using channel reciprocity and the network topology to select downlink MU-mimo recipients. The proposed solutions are standards compliant, do not require modifications at the user equipment and hence will work with legacy 802.11ac devices. We compare the performance of the D-mimoO architecture to a baseline dense enterprise Wi-Fi deployment, and observe 2:5x improvement in median and 104% increase in average downlink per-stream throughput.

关键词： distributed mimo MU-mimo user selection channel access Wi-Fi networks network architecture and performance

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